数控技术应用专业英语LS3-1

《数控技术应用专业英语LS3-1》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、学习情境3LearningSituation3CNCNontraditionalMachining班级学习任务1Task1CNCSinkerEDMMachine%学时Knowledgeobjects1.ToreadandlearnthebasicknowledgeofCNCSinkerEDMMachine・2.GraspthebasicprincipleofCNCSinkerEDM.3-LearnthecomponentofCNCSinkerEDM・4.Masterthegrammaticalstructures.Abilityobjects1.

2、HelpthestudentstolearnsomephrasalverbsandfunctionalitemsabouttheCNCSinkerEDMandtrytousethem・2.Strengthentheirabilitiesofreading.3.Improvetheabilityofgettingspecificinformationfromreadingthetext.4.Improvetheabilityofanalysisandsolvingproblem・5.Haveteamspritandresponsibility・Te

3、achingMethodsSpeaking;Discussing;Pair-work&group-workTeachingaids:Multi-mediacomputer;PPTTeachingcontentRemarksPartATechnicalReading1.TheBasicPrincipleofSinkerEDMSinkerelectricaldischargemachining{sinkerEDM)isthattheelectrodeandworkpieceareseparatelyconnectedtothetwopolesofpu

4、lsepowersupply,thepulsepowersupplygeneratesanelectricalpotentialbetweenthetwoparts.discharge[distja：d;j]v•放电sinkerEDM电火花成型加工electrode[ilek.tr^ud]n.电极pulse[pAls]n.脉冲potential[pa'tenjal]n.电位，电势Astheelectrodeapproachestheworkpiece,dielectricbreakdownoccursinthefluidformingaplasm

5、achannelandasmallsparkjumps.难点：电火花成型加工的原理Metalisremovedbyaseriesofdiscreteelectricaldischarges(sparks)causinglocalizedtemperaturesthatishighenoughtomeltorvaporizethemetal.[•系列不间断的火花放电产牛的高温把局部的材料融化或气化，从而去除材料。】spark[spa:k]n.火花melt[melt]vt.使融化,使熔化，使消散vaporize['veips^aiz]v.(使)蒸发A

6、sthebasemetaliserodedandthesparkgapsubsequentlyin-creased,theelectrodeisloweredautomaticallybythemachinesothattheprocesscancontinueuninterrupted・Theconstantpulsedischargewillreplicatethetoolelectrodeshapeontheworkpiecetocarryouttheshapedmachining.【这种不间断的脉冲放电将电极的形状复制到工件上以实现成型加

7、工】Fig.3-1-1ThemachiningprincipleofSinkerEDM1—workpiece;2一pulsepower;3—servomechanism:4一electrode;5—ielectricfluid;6一dielectricfluidfilter;7一pump2.CNCSinkerEDMMachineFig.3-1-3MajorcomponentsofsinkerEDMmachine1—pulsepower;2—servomechanism;3—ramhead;4—lectrode;5—workpiece;6一diel

8、ectric-fluidtank;7—filter;8—pump;9一dielectricfluidreservoir重点：学习电火花加